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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>课程介绍</title>
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<body>
    <main>
        <div class="vi">
            <span class="iconfont icon-zuojiantou" id="backBtn"></span>
            <video></video>
            <div class="describe">
                <span class="iconfont icon-youjiantou" id="playBtn"></span>
                <span>视频预览</span>
            </div>


        </div>
        <div class="box">
            <div class="weui-cell__bd">
                <span class="chocolate"></span>
                <div class="demo_badge_desc"><span id="calorie"></span>千卡 &emsp;<span id="time"></span>分钟
                    <span class="like">99.99w人练过&gt;</span>
                </div>

            </div>
            <div class="user df aic">
                <img width="80" id="pic">
                <div class="df fdc">
                    <span id="userName">用户名</span>
                    <span>三线达人课程设计师</span>
                </div>
            </div>
            <p id="desc"></p>
            <ul class="df jcsb">
                <li>
                    <h6><span class="iconfont icon-pinci"></span> 练习次数</h6>
                    <p>每周3-5次</p>
                </li>
                <li>
                    <h6><span class="iconfont icon-sds_di28leijianshenqicai"></span> 器械</h6>
                    <p>无</p>
                </li>
            </ul>
            <button id="starBtn">开始训练</button>
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    </main>
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